Simplify ownership handling of HTMLImportsController.

third_party/WebKit/Source/core/html/imports/HTMLImportsController.cpp

Index: third_party/WebKit/Source/core/html/imports/HTMLImportsController.cpp
diff --git a/third_party/WebKit/Source/core/html/imports/HTMLImportsController.cpp b/third_party/WebKit/Source/core/html/imports/HTMLImportsController.cpp
index 0337f262ae0893f9069e46b513466f1f67d8453e..0b0e915fd7abf8f6dbf9b06924a50368c85790bb 100644
--- a/third_party/WebKit/Source/core/html/imports/HTMLImportsController.cpp
+++ b/third_party/WebKit/Source/core/html/imports/HTMLImportsController.cpp
@@ -41,37 +41,12 @@
 
 namespace blink {
 
-const char* HTMLImportsController::supplementName()
-{
-    return "HTMLImportsController";
-}
-
-void HTMLImportsController::provideTo(Document& master)
-{
-    HTMLImportsController* controller = new HTMLImportsController(master);
-    master.setImportsController(controller);
-    Supplement<Document>::provideTo(master, supplementName(), controller);
-}
-
-void HTMLImportsController::removeFrom(Document& master)
-{
-    HTMLImportsController* controller = master.importsController();
-    ASSERT(controller);
-    controller->dispose();
-    static_cast<Supplementable<Document>&>(master).removeSupplement(supplementName());
-    master.setImportsController(nullptr);
-}
-
 HTMLImportsController::HTMLImportsController(Document& master)
     : m_root(HTMLImportTreeRoot::create(&master))
 {
     UseCounter::count(master, UseCounter::HTMLImports);
 }
 
-HTMLImportsController::~HTMLImportsController()
-{
-}
-
 void HTMLImportsController::dispose()
 {
     if (m_root) {
@@ -172,7 +147,6 @@ DEFINE_TRACE(HTMLImportsController)
 {
     visitor->trace(m_root);
     visitor->trace(m_loaders);
-    Supplement<Document>::trace(visitor);
 }
 
 } // namespace blink